Patent US1737347A successfully refreshed from Google Patents.
US1737347A
Expired / Lapsed
US
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Heat exchanger
Assignee: Standard Oil Co
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Filing: 1927-01-22
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Granted: 1929-11-26
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Expires: 1947-01-22
Abstract
No abstract record available.
Inventors
- 👤 Robert E Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:36
CPC Classifications
F; F28; F28F; F28F7/00; F28F7/02; F28F2275/00; F28F2275/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1932-11-25 | 1933-05-27 | 1933-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1936-11-25 | 1937-05-27 | 1937-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1940-11-25 | 1941-05-27 | 1941-11-26 | $7700.00 | Window Closed / Lapsed |